| //===--- Warnings.cpp - C-Language Front-end ------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Command line warning options handler. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is responsible for handling all warning options. This includes |
| // a number of -Wfoo options and their variants, which are driven by TableGen- |
| // generated data, and the special cases -pedantic, -pedantic-errors, -w, |
| // -Werror and -Wfatal-errors. |
| // |
| // Each warning option controls any number of actual warnings. |
| // Given a warning option 'foo', the following are valid: |
| // -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo |
| // |
| // Remark options are also handled here, analogously, except that they are much |
| // simpler because a remark can't be promoted to an error. |
| #include "clang/Basic/AllDiagnostics.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/DiagnosticOptions.h" |
| #include <algorithm> |
| #include <cstring> |
| #include <utility> |
| using namespace clang; |
| |
| // EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning |
| // opts |
| static void EmitUnknownDiagWarning(DiagnosticsEngine &Diags, |
| diag::Flavor Flavor, StringRef Prefix, |
| StringRef Opt) { |
| StringRef Suggestion = DiagnosticIDs::getNearestOption(Flavor, Opt); |
| Diags.Report(diag::warn_unknown_diag_option) |
| << (Flavor == diag::Flavor::WarningOrError ? 0 : 1) |
| << (Prefix.str() += std::string(Opt)) << !Suggestion.empty() |
| << (Prefix.str() += std::string(Suggestion)); |
| } |
| |
| void clang::ProcessWarningOptions(DiagnosticsEngine &Diags, |
| const DiagnosticOptions &Opts, |
| bool ReportDiags) { |
| Diags.setSuppressSystemWarnings(true); // Default to -Wno-system-headers |
| Diags.setIgnoreAllWarnings(Opts.IgnoreWarnings); |
| Diags.setShowOverloads(Opts.getShowOverloads()); |
| |
| Diags.setElideType(Opts.ElideType); |
| Diags.setPrintTemplateTree(Opts.ShowTemplateTree); |
| Diags.setShowColors(Opts.ShowColors); |
| |
| // Handle -ferror-limit |
| if (Opts.ErrorLimit) |
| Diags.setErrorLimit(Opts.ErrorLimit); |
| if (Opts.TemplateBacktraceLimit) |
| Diags.setTemplateBacktraceLimit(Opts.TemplateBacktraceLimit); |
| if (Opts.ConstexprBacktraceLimit) |
| Diags.setConstexprBacktraceLimit(Opts.ConstexprBacktraceLimit); |
| |
| // If -pedantic or -pedantic-errors was specified, then we want to map all |
| // extension diagnostics onto WARNING or ERROR unless the user has futz'd |
| // around with them explicitly. |
| if (Opts.PedanticErrors) |
| Diags.setExtensionHandlingBehavior(diag::Severity::Error); |
| else if (Opts.Pedantic) |
| Diags.setExtensionHandlingBehavior(diag::Severity::Warning); |
| else |
| Diags.setExtensionHandlingBehavior(diag::Severity::Ignored); |
| |
| SmallVector<diag::kind, 10> _Diags; |
| const IntrusiveRefCntPtr< DiagnosticIDs > DiagIDs = |
| Diags.getDiagnosticIDs(); |
| // We parse the warning options twice. The first pass sets diagnostic state, |
| // while the second pass reports warnings/errors. This has the effect that |
| // we follow the more canonical "last option wins" paradigm when there are |
| // conflicting options. |
| for (unsigned Report = 0, ReportEnd = 2; Report != ReportEnd; ++Report) { |
| bool SetDiagnostic = (Report == 0); |
| |
| // If we've set the diagnostic state and are not reporting diagnostics then |
| // we're done. |
| if (!SetDiagnostic && !ReportDiags) |
| break; |
| |
| for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) { |
| const auto Flavor = diag::Flavor::WarningOrError; |
| StringRef Opt = Opts.Warnings[i]; |
| StringRef OrigOpt = Opts.Warnings[i]; |
| |
| // Treat -Wformat=0 as an alias for -Wno-format. |
| if (Opt == "format=0") |
| Opt = "no-format"; |
| |
| // Check to see if this warning starts with "no-", if so, this is a |
| // negative form of the option. |
| bool isPositive = true; |
| if (Opt.startswith("no-")) { |
| isPositive = false; |
| Opt = Opt.substr(3); |
| } |
| |
| // Figure out how this option affects the warning. If -Wfoo, map the |
| // diagnostic to a warning, if -Wno-foo, map it to ignore. |
| diag::Severity Mapping = |
| isPositive ? diag::Severity::Warning : diag::Severity::Ignored; |
| |
| // -Wsystem-headers is a special case, not driven by the option table. It |
| // cannot be controlled with -Werror. |
| if (Opt == "system-headers") { |
| if (SetDiagnostic) |
| Diags.setSuppressSystemWarnings(!isPositive); |
| continue; |
| } |
| |
| // -Weverything is a special case as well. It implicitly enables all |
| // warnings, including ones not explicitly in a warning group. |
| if (Opt == "everything") { |
| if (SetDiagnostic) { |
| if (isPositive) { |
| Diags.setEnableAllWarnings(true); |
| } else { |
| Diags.setEnableAllWarnings(false); |
| Diags.setSeverityForAll(Flavor, diag::Severity::Ignored); |
| } |
| } |
| continue; |
| } |
| |
| // -Werror/-Wno-error is a special case, not controlled by the option |
| // table. It also has the "specifier" form of -Werror=foo. GCC supports |
| // the deprecated -Werror-implicit-function-declaration which is used by |
| // a few projects. |
| if (Opt.startswith("error")) { |
| StringRef Specifier; |
| if (Opt.size() > 5) { // Specifier must be present. |
| if (Opt[5] != '=' && |
| Opt.substr(5) != "-implicit-function-declaration") { |
| if (Report) |
| Diags.Report(diag::warn_unknown_warning_specifier) |
| << "-Werror" << ("-W" + OrigOpt.str()); |
| continue; |
| } |
| Specifier = Opt.substr(6); |
| } |
| |
| if (Specifier.empty()) { |
| if (SetDiagnostic) |
| Diags.setWarningsAsErrors(isPositive); |
| continue; |
| } |
| |
| if (SetDiagnostic) { |
| // Set the warning as error flag for this specifier. |
| Diags.setDiagnosticGroupWarningAsError(Specifier, isPositive); |
| } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) { |
| EmitUnknownDiagWarning(Diags, Flavor, "-Werror=", Specifier); |
| } |
| continue; |
| } |
| |
| // -Wfatal-errors is yet another special case. |
| if (Opt.startswith("fatal-errors")) { |
| StringRef Specifier; |
| if (Opt.size() != 12) { |
| if ((Opt[12] != '=' && Opt[12] != '-') || Opt.size() == 13) { |
| if (Report) |
| Diags.Report(diag::warn_unknown_warning_specifier) |
| << "-Wfatal-errors" << ("-W" + OrigOpt.str()); |
| continue; |
| } |
| Specifier = Opt.substr(13); |
| } |
| |
| if (Specifier.empty()) { |
| if (SetDiagnostic) |
| Diags.setErrorsAsFatal(isPositive); |
| continue; |
| } |
| |
| if (SetDiagnostic) { |
| // Set the error as fatal flag for this specifier. |
| Diags.setDiagnosticGroupErrorAsFatal(Specifier, isPositive); |
| } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) { |
| EmitUnknownDiagWarning(Diags, Flavor, "-Wfatal-errors=", Specifier); |
| } |
| continue; |
| } |
| |
| if (Report) { |
| if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags)) |
| EmitUnknownDiagWarning(Diags, Flavor, isPositive ? "-W" : "-Wno-", |
| Opt); |
| } else { |
| Diags.setSeverityForGroup(Flavor, Opt, Mapping); |
| } |
| } |
| |
| for (unsigned i = 0, e = Opts.Remarks.size(); i != e; ++i) { |
| StringRef Opt = Opts.Remarks[i]; |
| const auto Flavor = diag::Flavor::Remark; |
| |
| // Check to see if this warning starts with "no-", if so, this is a |
| // negative form of the option. |
| bool IsPositive = !Opt.startswith("no-"); |
| if (!IsPositive) Opt = Opt.substr(3); |
| |
| auto Severity = IsPositive ? diag::Severity::Remark |
| : diag::Severity::Ignored; |
| |
| // -Reverything sets the state of all remarks. Note that all remarks are |
| // in remark groups, so we don't need a separate 'all remarks enabled' |
| // flag. |
| if (Opt == "everything") { |
| if (SetDiagnostic) |
| Diags.setSeverityForAll(Flavor, Severity); |
| continue; |
| } |
| |
| if (Report) { |
| if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags)) |
| EmitUnknownDiagWarning(Diags, Flavor, IsPositive ? "-R" : "-Rno-", |
| Opt); |
| } else { |
| Diags.setSeverityForGroup(Flavor, Opt, |
| IsPositive ? diag::Severity::Remark |
| : diag::Severity::Ignored); |
| } |
| } |
| } |
| } |
